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This operator creates and returns a function equal the sum of the
functions f1 and f2. The argument functions
f1 and f2 must be defined on the same interval.
The resulting function is defined on the same interval as the arguments. See
also: IloNumToNumStepFunction.
This overloaded C++ operator returns an expression equal to the sum of its arguments. Its arguments may be numeric values, numeric variables, or other expressions.